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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88debf08fb5477ce2fea89ec202949f0fae30cf6fcbfc2d6774fcc2526b34601' 
  AND token = 'MyX7bLC0e5mfLvwAJS/8/Ibu08MdeOtXehQ4QOR2lek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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