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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6da9559d7e9f06ab8466c3e25695d775a9b54a58199bbb287905e50f5b3044d' 
  AND token = 'NtVk26YsWeypD5jQsS/mtul3M9Am9/W6wxPvV60je9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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