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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d2beb93f91c3bd31ad6e5e61a5ae3245ac53e7fe4acc636a2c390863df2e42' 
  AND token = 'j7dIGqSmGwg9BnAkhQQHfej8QLFpdkzR/9CBMWhj5Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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