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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5767018e08d6c3b42194b913a71ac2c4b24ea9d75c0184fb97e3f17ea9406ae' 
  AND token = 'eebemYYtdlOYO/dEmDI2461rvfypTd/LKug86IEDRBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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