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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5b7b1ce29c7af4cc993c8d07c0dc99be1b236b4abdfcabb8e7162a50c1cf1c' 
  AND token = 'RjIcZD2Tzi0eNItxejZyefMaQJQA298HcV4UZwBG1es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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