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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df6390b95b7b21e75d5aedfcc46dee127adbbd701e9bcaa6b6af929917dcb67' 
  AND token = 'Y9YWbC5x5Zn5F2qa+ZZ4K/b69Ao/8+0/uqMhajAvZBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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