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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e4f9344664a07f496a397c7552aea8a802f676bc0f0c42b340bffb2b7b32da' 
  AND token = 'qF6aueM4eaCt8NBsjBsqPxmoswUS+C0jv3b9xQIwc9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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