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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8cbaaa76db09c34743eb3a861288998496810e50936dcc7ffd27f1533b7eea' 
  AND token = 'Vc/ha6At+dL1934NR5epokYir+G3/yQv2/PaL1Prm+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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