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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ad4e71c7a8e7e98d25b0c5f06f8ba142991addcb5cd712d1f45347c5421f74d' 
  AND token = 'A65NZMd4VhHPULrVhuJI3fXjrEuCFdDDRbSMzgwje+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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