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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d9ed82224f57ae31e34e68313abb2491b269053a86df3253524bffbb9d694f' 
  AND token = 'DRkV/I8x4ASjZCn6eH+gZ8Av4slId56niC7joiTY6JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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