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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28a6ec989a8c554d0cf29ad5d35eba887062a98ac07f3f2aaa292e8ff35232e' 
  AND token = 'WW9z1wsqkDHzOstlEA7uDP8lgxX/e+x8sbtq1nPRgUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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