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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0697f08d270b2c08ef78f72e9283a3a80692ab3db7aafd9cf53dc489a18e20d5' 
  AND token = 'nemUi2TpkMbcmAMmy/yBf92IGiezVeyr+UPagNqied0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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