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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebd12f91642e7544a02358a6d60a6b8b8449f60ae91975ebe50284926114798' 
  AND token = 'VEIa7gtxR40Sje1gLncWbORhv+c9z7Qje1u21WqCTcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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