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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36aa60c39b2afc23a00dad663acb8721d7aaf54b68abcdfdf0b827c550873679' 
  AND token = '8vsxld3f4vC12GrPkc2iF6FoqqrOZlJu3SPB59wHt+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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