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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd90ca69d3b98f694f9e677317c826b74d69a92aac967759180c72c6fef694c' 
  AND token = 'fy6MqaZum4SYP/88vymLsv3qZIBUCGq2Zc372jTOHP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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