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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de7ce87d2a4af390a1f6a185c07f2ce7e4dc4c5ba1dbff0419dff51001424eb' 
  AND token = 'OYPYsip58agVaicRMxQf2vKHPNr6ViYW/4Qm0ed7nlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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