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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394a7e2309386313dd4f123b17ac5d311d59ea0e6847427d069a9fea9fb2907d' 
  AND token = '6W8Gz1YPUQtq5xXJxlN50SAzuthKVq9zhwPNC1iaJWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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