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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32c0612f436485cf2cddc1236c3330091922599bd845eed8140d8f41fdad78e' 
  AND token = 'Ua8IZO7GQt9PFDlpS50zFBWnnIiujbR5rSoielKwj9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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