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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '762e63144eee65e7ade972a1944fb371073a8bf789376f2ad34856c80d85ca4f' 
  AND token = 'esAonZFTORwnJXkHH3qmjVJ+vk1Jo+JRakyUqq38vCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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