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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ba40adc2c52f932fe58646c99ab07cb836c24e9f972c14c783715ca0bab8f0' 
  AND token = 'D3Dpeo8R86V8OW+3SpY2X9nt+gFL0JV8GipRwctYEVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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