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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8295a07b09b43e78dc5c306ab859c6e8e6247d75c7b5b2542f2c4e6b6d683be3' 
  AND token = 'H83SNzyh9ELF4QepcvsJngBzZEREpXx17Gdzad4ylVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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