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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d6684a460dba303ec9540927a39ae9b25512ada6ea4a12d5eb41f1f1990a60' 
  AND token = 'MTPXdWj/Bb4I9/Wz26wAqgsD+jfmVFOmGTsxnou4Yf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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