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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eeb47716ec8d591bfe3b5a97810f56b4a4eb5e96eebe24c4eb54567689c80aa' 
  AND token = '5TFZShY+vpi/23lVrJwI2J2WG9xhC6xJ2qTCNHPMJ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}