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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5332ac9f8d2ed35448e038f2dfa4820f01932dffa30d9461745c507e765848' 
  AND token = 'FBH6oMZNahzFTBEu9M4vOpqzUbYJ6SESPV6DrXWyd9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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