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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3031f166a89a121397d3582dd026a4bdc03a7d1e546c0aa2d339eed3dc3ff5bd' 
  AND token = 'XIpWxViYCOs9yJD8/dtXroYSw3SzxY+X9G4LqNWRWdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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