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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e07e742e5e674c3f9ca29844787e3f83cb0985f2784b80037047e13094fc37' 
  AND token = '8JwY8po6ocO7CCC6pBaugFy1NxbftzpB/+O69y3GGMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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