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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca3d0a9dd83d049de055a3e7d020e26dfa547f7c0f88b44cd11f2a89f6b996d' 
  AND token = 'VaCVtcXVevr8VKmhPOWH6iBr00KMu1G2xHJR7xLUcEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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