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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bebf44b915dac9d13ca07b5f1f1417dfc3b18000b7d67a898aa668149f4aae9' 
  AND token = '46rSZwQpYRIGesJdSxfG6gX2+JuseTbv1yWi0zwRIX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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