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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0dc53f9262b0bb7b7070ca81c56094d6a8095b3f98d752d504dd9b0867dc9c2' 
  AND token = 'qTzfu+YWvtv9K5A56jtf+iym2XsSYX3eug8XVEf6ATo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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