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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca5c9e07fb3d133eadd1cde5e73c7436b92ed29fd36f14aa08e1a1ed48e6fef' 
  AND token = 'SIc1y0yAkQLAO+IBmbq0+WRIQ+0IHU+tOiod4McjJMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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