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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5280bd2e697e158061a1efee5458ec7510e03c58152d3b46acb998b648205ef7' 
  AND token = 'qZ8Bl6XZqv2bx11wsO0JsDjIzqqruIXD21iG6w2WAAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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