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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168995cc15708749235a8bb31ef336c72da304d164e1c81f8bc4a4b862379d04' 
  AND token = '/8/XR8FiSD9okyYyBAk1WNFz5zUp84VJrwtAu2GnMQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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