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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a950eb0169e1bac5d5929055cffee2c76297f8ee74697d551a04a0776fa6a87' 
  AND token = '/jaypnACqJSXRb2xOGDE3jJpIGas0qig83gpCkWMTDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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