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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d182e90c3993fdf53a6cc74ffb4a22f14360aef6168ca3a238caa66500926c' 
  AND token = 'jagFE8G0apZ73x1M/ieIdNyKX68dwPbkfeypLPIwyxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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