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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '159d7b4e15fdeeb0a9356f7c61552b6292ab22a08db785ef89882e9be5086665' 
  AND token = '/qwFCgkQSo3bB5rqqBO+9nwt8gQEdz1n3p+jSmdyEt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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