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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77df188df7412807afa168fcc2cb88b3dc480d8ce25cac1eb24ea8980b870d5f' 
  AND token = 'Ls54WAvNbqj77rAdm8pIyrCWD78DizLsJlhbOzixKOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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