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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02ba1b0efee349267a8be1a12b3a737998db953a580bfe3cc42100e843f905a' 
  AND token = 'zFEwWd/4WTn3VyGJDycigxXa2TrI3r5rOZAPmqNwTwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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