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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '676583e77b5d538a70f1c5d5a490e74447b0b6e9061fd457da1a93df28c5f86c' 
  AND token = 'jYqg9d78VAquvt3RwIe1EHgLR8X+/1NQ3IsdTirAOTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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