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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025bcf262f38a2051bd64333af72098798196522f62f8a229432783e716fb28c' 
  AND token = 'oo64eBiCC6g8wsvYR3jdSzdH0LBdHh2o4ckGIc/Vr1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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