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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20699502d66fb8d45839e74fb1de285ee88e21784db53362a15d5fe948544c6f' 
  AND token = 'OqO3hBXNmlTYF+k/FybQ46FA7w+/6bo3rFjNP5/p4t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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