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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0328b897f663f6a0c8a57b1370f9c6ff128005b126e0e431a68b0620555e44' 
  AND token = 'yzGY3Lme2x3x+DbVfjJRHpnUg5RIaCVO98gGU0Q9lyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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