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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc67f3ab06b86d6aeaea74e317cdb992ccc8996bbb2332cb435ae9fc6dbc7e9' 
  AND token = 'W48G7LoJUgrdkpcLeJQ9zToNbIBRXL+uNTPyI3BNUjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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