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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4fbfb4ae9d0def42edd6a7af3e6093dad9109b5c7fb680d6b10905746d6bdd5' 
  AND token = '7P+vK2CCKKmicW/yYoiSAa2m/n8xBwUTnpJbh/Z+DlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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