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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d316b8a3bfa20e8dc00b17efa287e9e5bdaf0f975a8b18ac2e9d44b758511c2' 
  AND token = 'hK0xK2J5n10EquyfJLG9tV1FDFOb2y/GWJmgV5eANvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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