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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6231b9f5b9865d144b504eb053f9cca526830af1893d5ad41644da2dde1c80ec' 
  AND token = 'vyw0fHJMA7hgJM3RehRRXWMgU1uYbn4y1vghcy5Mknw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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