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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba3a2921f0f03daa99498d644db5c42e0d7bf5ca19204650da7333c5c53f3e3' 
  AND token = 'm6oHpCpVG0qhcCi2qaj5QVJXkkGaUcIH78Dnj8I30XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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