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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7172acf77a2da144133d685c0a1d4f8b2a06a403ea0f7ca33843797ca4ff44' 
  AND token = 'lq048/voGtwCtfRWLaAHanC26E0+pHhDaS4xGY+8i8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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