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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee335a154915a5dcca5f7f9d76e18b706a7dd9fbc61087efa5bbacf95902adf7' 
  AND token = '+YEWShjJpYFGupMnuCmJJ6GMZLFm8isCrydbV40oF/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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