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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31afe4b1dc084ae537228c9e62b9de2bde0d108ded4c7e413c71908760be1b8' 
  AND token = 'v9TzFlqt8Q5RkmjhU6770c7AYnnQ1x6yoVrSvhzJ2yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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