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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7313b224af5daeab2ac7c6bc99a31be994f5097871e49c45082d0dcc60993a6' 
  AND token = 'nFNRddZU2c1Yx7yq93lO/pzgDwUjkCkoHEnd362YLR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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