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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7205657cd26167ad9f4720a2980d36b5c61aaf430168df03158b4873e001e892' 
  AND token = 'NdW4aYu1xQSpALa2RO4UTqSNr45Vwg24Cob5Id03jOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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