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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4fe031ba0e4d4c56ad8b94e322d81050e632f0c64a8ea1655561aaae6a6f7b' 
  AND token = 'H6Ney1X6+jQHIGmeYzkTP0MPoQD4+xlyUVYLuMduT4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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