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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4440eb3cfe76891e66370b5d54c763172a4f0286b52d82858bf06d8f377a6d' 
  AND token = 'CoEybbpxq48ht3wwzJ9QoDmcs00fat1bT2EQpu4XFUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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