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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fcb4c842947504b233dcf95a8b705987d382e9132903aebdf037471c72724c5' 
  AND token = 'Q57Xha+s3kFlzS+gXceIvt9tF/rUcg1fWj9oFVoqGXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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