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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c01e03e4db2e92e4a55aae674e0acda6d510df60e7a35a179dd82df260636f5' 
  AND token = 'UVpToF053Tnwy/xCd4Q0vGbXk6E6zYxL+GQ3scgR6Ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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