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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb24d906ac8a19a98671a4d80c48916e48168b22ae3df2873be405b8d4ab720' 
  AND token = 'jYrk6M/pNi5UFK4q7yt/6W8lvWKpJm2ADSdKPaO5GRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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