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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0ac51ec11a98c66a42f85319bc29fb70aabf4bb89a48b3ccf360761e8bf845' 
  AND token = '2hwzsissGaqZ5kUqZ23OIc51rK610CFLTQMbVBhE41g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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