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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0b70a2c66506c60df31e1954fa8ddf9c2e2cef6cf9246659af7296dd4c4049' 
  AND token = '8zPmuhW1c6wrVyOmPrDAZrzYSJMynfYjStFaaP540kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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