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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4043dd867a0270ad97b9fb3fc91eba846540ee91e5b399f73af39fe6d55f3ab' 
  AND token = '7zgf2sQjzPORoFzXIU0fhOP/DJ4/6JbTbdNIy2lA/4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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